Unlike the previous iterations, however, this is a release and not a snapshot.

I don't really get the difference between a RELEASE and a SNAPSHOT. I've read the blog post. But still can't quite get my mind around it.

A snapshot is an "picture" taken at a certain moment of time. For example, the previous ISO image what really a picture of what Solus was on April 18th.
This version is called "release" because it brings out of the box difference with what the current users have (here are a few ones, the detail is in the blog post)

I don't really get the difference between a RELEASE and a SNAPSHOT. I've read the blog post. But still can't quite get my mind around it.

A snapshot is an "picture" taken at a certain moment of time. For example, the previous ISO image what really a picture of what Solus was on April 18th.
This version is called "release" because it brings out of the box difference with what the current users have (here are a few ones, the detail is in the blog post)

I've bold-texted/underlined "what Solus was...". "Solus" in this sentence refers to the last official release version which I think was version 1.2.

It was released some time before 18 April 2017 with a default set of applications and programs and a default gtk theme (arc) and icon set (arc icons + Moka/Faba). Say you kept updating this release without ever adding to or uninstalling any of the default applications that came on the iso. You didn't change the looks and theme or default settings. Then on 18 April 2017 you froze this updated version of Solus 1.2 as an iso, that would be a "snapshot".

But Solus 3 is a "release" because it is not just an up to date Solus 1.2. Its default applications and programs are slightly different. For instance, the default login greeter is slick-greeter now whereas in 1.2 it was lightdm-gtk-greeter. The default theme and icons are different. The configurations set up as default are different, for instance the Budgie panel is now at the bottom.